Malicious PDF — malware analysis report

Static analysis result for SHA-256 07027d7787168229…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 09:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfeae1cc87b7f6f516ab09c16fed1e00 SHA-1: 7805a3cd6f03ad1c290d402e967051f0fa78ad74 SHA-256: 07027d778716822973735339e26b28a6dcf28638f0cdf292e7f9e0425b38ac57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing or trojan PDF. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=what+is+a+reader+writer
    • https://cdn.sqhk.co/talokelom/NjjI5ia/tambourine_definition_tagalog.pdf
    • http://modebedunizux.iblogger.org/32453737516.pdf
    • https://cdn.sqhk.co/wemulekojex/i7cggic/38691022951.pdf
    • https://cdn.sqhk.co/sebutarukaw/bvmagcK/alchemy_transmute_or_elixir_master.pdf
    • https://cdn.sqhk.co/fuluzagile/eW0jexu/zalifobubelisiwodi.pdf
    • https://cdn.sqhk.co/nadovexum/dPSjgjf/bsl_dictionary.pdf
    • http://nuraramibifowom.22web.org/tegabupapaxitokig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_cbefec1b7f224c59b8079b0d418681a5.pdf?index=true
    • https://s3.amazonaws.com/bezorito/67247361403.pdf
    • https://s3.amazonaws.com/liguwubore/briquettes_project_report.pdf
    • https://uploads.strikinglycdn.com/files/532a6731-9e96-41d8-8f85-2fa0df7128ab/how_to_make_a_safety_plan_domestic_violence.pdf
    • https://s3.amazonaws.com/varolexexus/la_biblia_de_jerusalen_en_descargar_gratis.pdf
    • https://uploads.strikinglycdn.com/files/935c3674-aadd-4eaa-b11a-a45638e2c197/busozadime.pdf
    • https://s3.amazonaws.com/xoferuzu/nuwinigilosizudevuxilagi.pdf
    • https://s3.amazonaws.com/najipavez/autocad_trueview_2014_64_bit.pdf
    • http://pukupufiribeja.epizy.com/visadebadotuj.pdf
    • http://zinizebaki.epizy.com/how_to_play_videos_on_sony_xav_ax5000.pdf
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_810927da7532476dac07ec8a7775a59d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/782f9550-bd41-4240-becb-46d9cb379b0a/math_workbook_grade_2.pdf
    • https://uploads.strikinglycdn.com/files/e341ad00-d251-4d5a-aefa-5d836691c096/82072673310.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece6.bin
bb4a348c6039443ee44b1d75131acd0c2aeac67dcb597098aed565b6fa1ad007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 4988 bytes
font_01_sfnt_off0000fde8.bin
93b5e039dedeb8acbe44d6a8530fb70089cfe86f169705d7039ee214a6b17ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 11116 bytes

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